This is a clone of issue RHEL-132569 to use for version rhel-9.8
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Original description:
Reproducer:

• In webui, go to dashboard and click "Setup Cluster"
• In displayed wizard, type cluster name and necessary nodes
• Continue to "Advanced options" > "Transport Options"
• Click "Add link" and fill "Node address" (required) and one of optional fields (e.g. Link priority - put number there or you get standard validation error)
• Continue to review and click "Setup Cluster"
• You get an error (depending on backend version, most probably something "A communication error occurred during the operation...")

Background:

Webui sends "linknumber" as integer. However, backend pcsd tightened the type checking of the request - the "linknumber" must be string.